PLANTRONICS Blackwire 700 C710-M(87505-01) USB Connector Supra-aural Over-the-head, Monaural (Microsoft) Wireless Type: Bluetooth Operating Time: Up to 10 hours, up to 10 days standby time, up to 6 hours listening time (A2DP) Headphone Signal to Noise Ratio(SNR): PC wideband audio with noise-canceling microphones for high-quality PC telephony Headphone Sensitivity: 118dB S.P.L. at 1KHz Weight: 0.8 Microphone Impedance: Dynamic EQ, microphone frequency response 100 Hz-8kHz optimal for wideband voice telephony (up to 6,800 Hz)enhanced digital signal processing (DSP), noise-canceling microphone, A2DP